Mate in 47

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Michael Diosi
Posts: 672
Joined: Mon Jun 22, 2009 11:37 am

Mate in 47

Post by Michael Diosi » Wed Dec 30, 2015 12:57 pm

Hi,

[D]8/3K1ppp/8/2p5/n1B5/b1p5/1pP1rpp1/1R1Rqkrb w - -

Mate in 47
Alexey Khanyan
Grigory Popov
SuperProblem 2014
Recommended Special prize

Have fun!
Mihcael Diosi
http://www.playwitharena.com

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Ajedrecista
Posts: 1421
Joined: Wed Jul 13, 2011 7:04 pm
Location: Madrid, Spain.
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Re: Mate in 47.

Post by Ajedrecista » Wed Dec 30, 2015 5:41 pm

Hello Michael:
Michael Diosi wrote:Hi,

[D]8/3K1ppp/8/2p5/n1B5/b1p5/1pP1rpp1/1R1Rqkrb w - -

Mate in 47
Alexey Khanyan
Grigory Popov
SuperProblem 2014
Recommended Special prize

Have fun!
Mihcael Diosi
http://www.playwitharena.com
According to YACPDB, the solution is:

[pgn][Event "www.superproblem.ru (C004)"]
[Site ""]
[Date "2014.02.04"]
[Round "?"]
[White ""]
[Black ""]
[Result "1-0"]
[SetUp "1"]
[FEN "8/3K1ppp/8/2p5/n1B5/b1p5/1pP1rpp1/1R1Rqkrb w - - 0 1"]
[Termination "normal"]
[PlyCount "93"]

1. Kc6 Bb4 2. Kb5 Ba3 3. Kxa4 Bb4 4. Kb5 Ba3 5. Ka5 Bb4+ 6. Ka4 f6 7. Kb5
Ba3 8. Ka5 Bb4+ 9. Ka4 f5 10. Kb5 Ba3 11. Ka5 Bb4+ 12. Ka4 f4 13. Kb5 Ba3
14. Ka5 Bb4+ 15. Ka4 f3 16. Kb5 Ba3 17. Ka5 Bb4+ 18. Ka4 g6 19. Kb5 Ba3 20.
Ka5 Bb4+ 21. Ka4 g5 22. Kb5 Ba3 23. Ka5 Bb4+ 24. Ka4 g4 25. Kb5 Ba3 26. Ka5
Bb4+ 27. Ka4 g3 28. Kb5 Ba3 29. Ka5 Bb4+ 30. Ka4 h6 31. Kb5 Ba3 32. Ka5
Bb4+ 33. Ka4 h5 34. Kb5 Ba3 35. Ka5 Bb4+ 36. Ka4 h4 37. Kb5 Ba3 38. Ka5
Bb4+ 39. Ka4 h3 40. Kb5 Ba3 41. Ka5 Bb4+ 42. Ka4 h2 43. Kb5 Ba3 44. Ka5
Bb4+ 45. Ka4 Ba3 46. Kxa3 Qxd1 47. Rxd1# 1-0[/pgn]

Houdini 3 (mate search = 47) and SF 6 see the checkmate around 14 or 15 moves before the last move. Houdini also reports 0.00 score from the very first move in few time, I would say that less than two minutes in an Intel Pentium D930 (3 GHz) from year 2006, using 512 MB of hash and 5-man Nalimov EGTB.

Regards from Spain.

Ajedrecista.

peter
Posts: 1884
Joined: Sat Feb 16, 2008 6:38 am
Full name: Peter Martan

Re: Mate in 47

Post by peter » Wed Dec 30, 2015 8:26 pm

Hi!

Nullmove off:

8/3K1ppp/8/2p5/n1B5/b1p5/1pP1rpp1/1R1Rqkrb w - - 0 1

Analysis by Komodo 9.3 64-bit:

1.Kc6 Lb4 2.Kb5 La3 3.Kxa4 Lb4 4.Kb5 La3 5.Ka5 Lb4+ 6.Ka4 g6 7.Kb5 La3 8.Ka5 Lb4+ 9.Ka4 g5 10.Kb5 La3 11.Ka5 Lb4+ 12.Ka4 h6 13.Kb5 La3 14.Kb6 Lb4 15.Ka6 La3 16.Kb5 Lb4 17.Ka4 g4 18.Kb5 La3 19.Ka5 Lb4+ 20.Ka4 g3 21.Kb5 La3 22.Ka6 Lb4 23.Kb6 La3
+- (#59) Tiefe: 42 00:05:53 10368MN

Don't want to wait till number of moves to mate get lower, exact solution would take very long or wouldn't be got without Backward at all probably
Peter.

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